#include <stdio.h>

int main(int argc, char const *argv[])
{
    int a[3][3] = {1,2,3,   4,5,6,   7,8,9};

    // 元素类型： int (*) [3]
   int (*b[3])[3] ;
   b[0] = &a[0]; // b[0] --> a[0]
   b[1] = &a[1];
   b[2] = &a[2];

   int sum = 0;
   for (int j = 0; j < 3; j++)
   {
       for (int i = 0; i < 3; i++)
           sum += (*(b[j]))[i];
   }
   printf("sum: %d\n", sum);

   return 0;
}
